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A study on the application technique of remote sensing image for optimum route selection of the two-tract line railroad
2) Correction Estimation
To create Ortho-Projection Image, we carried out the following two corrections:
 Figure 2. Road network overlaid on correction image 3D Perspective Image Mapping Using Satellite Image 1. Preliminaries to Perspective Image Mapping For Perspective Image Mapping, we used the image creation techniques based on Projection View Method. As preliminaries to Perspective Image Mapping, we prepared information like table 2. and set up fusion-image mode to express textures of terrain softly. TABLE 2. Image data of perspective map
 FIGURE 3. RGB image + vector road  FIGURE 4. DEM + vector road 2. Perspective Image Mapping by Projection View Method In this study, Perspective Image Mapping model was made through the composition of various files to express in Perspective Map using PCI Modeler. To describe it briefly, the process is as follows; Inputting RGB channel, DEM channel and Vector layer through IMPORT module Creating projected image through Image Projection Algorithm of PSGIMAG module Showing the results on the computer screen through VIEWRGB module Creating the files of 3D Perspective Image Map through EXPORT module.  FIGURE 5. Perspective formation diagram TABLE 3. Perspective production model
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